Maxim Integrated MAX1247BEPE

Description
The MAX1246/MAX1247 are 12-bit data acquisition systems that combine a 4-channel multiplexer, high-bandwidth track/hold, and serial interface with high conversion speed and low power consumption. They operate from a single 2.7V to 3.6V supply (MAX1246) or 2.7V to 5.25V supply (MAX1247). The analog inputs are software configurable for unipolar/bipolar and single-ended/differential operation. The 4-wire serial interface connects directly to SPI/QSPI/MICROWIRE/TMS320-family devices without external logic. The MAX1246/MAX1247 use either the internal clock or an external serial-interface clock to perform successive-approximation analog-to-digital conversions. The MAX1246 has an internal 2.5V reference, while the MAX1247 requires an external reference. Both parts have a reference-buffer amplifier with a 1.5% voltage-adjustment range. They provide a hard-wired SHDN pin and a software-selectable power-down, and can be programmed to automatically shut down at the end of a conversion. Accessing the serial interface automatically powers up the MAX1246/MAX1247, and the quick turn-on time allows them to be shut down between all conversions. This technique can cut supply current to under 60µA at reduced sampling rates. The MAX1246/MAX1247 are available in a 16-pin DIP and a small QSOP that occupies the same board area as an 8-pin SO.

Features
4-channel single-ended or 2-channel differential inputs
Single-supply operation:
2.7V to 3.6V (MAX1246)
2.7V to 5.25V (MAX1247)
Internal 2.5V reference (MAX1246)
Low power:
1.2mA (133ksps, 3V supply)
54μA (1ksps, 3V supply)
1μA (power-down mode)
SPI/QSPI/MICROWIRE/TMS320-compatible 4-wire serial interface
Software-configurable unipolar or bipolar inputs
16-pin QSOP package (same area as 8-pin SO)

Applications
Portable data logging
Medical instruments
Battery-powered instruments
Process control